Brown tinged cm...

Amber
Today twice when I've wiped I've had brown tinged cm like old bloods been mixed into it and then another time I had a tiny dark reddish purple clot (apx 4mm). 
My fertility nurse said it can be totally normal and some women bleed their entire first trimester...but I can't help but be terrified after it taking four years and four <a href="https://glowing.com/glow-fertility-program">IVF</a> rounds to get me pregnant. I'm on progesterone tablets and vaginal tablets, five weeks tomorrow, hcg yesterday was 1550.